Abstract

The structural unit of the title compound, [K(C6H3N2O4)(C6H4N2O4)(H2O)2]n, consists of one potassium cation, one hydrogen pyrazine-2,3-dicarboxyl­ate anion, one pyrazine-2,3-dicarboxylic acid mol­ecule and two water mol­ecules; this is twice the asymmetric unit, since the potassium cation lies on an inversion centre. Each anion or acid mol­ecule is linked to two potassium cations, while the potassium cation has contacts to four symmetry-equivalent organic ligands, with two different coordination modes towards this cation. In addition, each potassium cation is coordinated by two water O atoms, raising the coordination number to eight. One of the carboxyl groups of the acid retains its H atom, which forms a hydrogen bond to a coordinated water mol­ecule. The other carboxyl group is deprotonated in half of the ligands and protonated in the other half, taking part in a strong O—H⋯O hydrogen bond disordered over an inversion centre. The stabilization of the crystal structure is further assisted by O—H⋯O and O—H⋯N hydrogen bonds in which water acts as the donor.

Highlights

  • The structural unit of the title compound, [K(C6H3N2O4)(C6H4N2O4)(H2O)2]n, consists of one potassium cation, one hydrogen pyrazine-2,3-dicarboxylate anion, one pyrazine-2,3dicarboxylic acid molecule and two water molecules; this is twice the asymmetric unit, since the potassium cation lies on an inversion centre

  • Each anion or acid molecule is linked to two potassium cations, while the potassium cation has contacts to four symmetry-equivalent organic ligands, with two different coordination modes towards this cation

  • Each potassium cation is coordinated by two water O atoms, raising the coordination number to eight

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Summary

Structure Reports

Poly[diaqua(l2-3-carboxypyrazine2-carboxylato)(l2-pyrazine-2,3-dicarboxylic acid)potassium(I)] Mustafa Tombul,a* Kutalmis Güvenb and Ingrid Svobodac a Department of Chemistry, Faculty of Arts and Science, University of Kirikkale, Campus Yahsihan, 71450 Kirikkale, Turkey, bDepartment of Physics, Faculty of Arts and Science, University of Kirikkale, Campus Yahsihan, 71450 Kirikkale, Turkey, and c Structural Research, Materials Science, Darmstadt University of Technology, Petersen Strasse 23, D-64287 Darmstadt, Germany

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